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Reed

Reed, commonly referring to the plant Phragmites australis, is a tall perennial grass of the Poaceae family characterized by robust stems reaching 1 to 6 meters in height, broad leaves, and feathery panicles of flowers, thriving in wetland environments through extensive rhizomatous growth that enables dense clonal stands. Native to much of Eurasia, Africa, and parts of North America, it has been introduced widely elsewhere, often via rhizome fragments or seeds dispersed by wind and water. Ecologically, P. australis stabilizes shorelines and provides for certain , such as nesting in its stands, while its deep root systems aid in accretion and cycling in marshes. Historically, humans have utilized it for practical purposes, including roofs, weaving mats and baskets, constructing fences, and crafting musical instrument reeds due to its stiff, hollow stems; employed it medicinally for treating ailments like and as a for skin issues. However, the non-native subspecies P. australis subsp. australis, introduced to North America around the 1800s likely through European shipping ballast, has become aggressively invasive in wetlands, forming monocultures that outcompete native vegetation, reduce biodiversity, alter hydrology by increasing evaporation and sedimentation, and diminish habitat quality for amphibians, fish, and waterfowl. This invasion displaces indigenous subspecies like P. australis subsp. americanus, leading to costly management efforts involving herbicides, mowing, and burning, as the plant's resilience—via persistent rhizomes up to 1 meter deep and prolific seed production—resists eradication.

Biology

Plants and Species

The term "reed" commonly refers to tall, perennial grasses in the family that thrive in environments, featuring hollow stems, long linear leaves, and plume-like inflorescences. These propagate primarily via rhizomes, forming extensive clonal stands that stabilize sediments and provide habitat in aquatic and riparian zones. Key genera include and Arundo, with species adapted to temperate and subtropical climates worldwide. Phragmites australis, the common reed, exemplifies the genus and is a reaching 1–6 meters in , with stout stems up to 2 cm in diameter and leaves 1–4 cm wide by 15–75 cm long. Its is a dense, nodding 15–40 cm long, producing wind-dispersed , though reproduction is predominantly vegetative. Native to , , and , it has a , occurring on every continent except , often in freshwater marshes, riverbanks, and disturbed saline habitats. In , genetic analyses distinguish a native lineage (P. australis subsp. americanus), present since the Pleistocene with lighter green leaves and less aggressive growth, from the non-native Eurasian subsp. australis, introduced around 1800 and now dominant in invasive populations due to higher and viability. A third Gulf Coast lineage also exists but is less widespread. Arundo donax, known as giant reed, is another prominent species, growing 3–8 meters tall with broader leaves (5–8 cm wide) and a more robust rhizome system than Phragmites. Native to the Mediterranean Basin and parts of Asia, it tolerates drier conditions than typical reeds but invades riparian areas in the United States, where it was introduced in the 1700s for erosion control and biofuel. Its sterile seeds and fragmentation enable rapid spread, outcompeting natives in California and the Southeast. Unlike Phragmites, A. donax rarely flowers in non-native ranges, relying on vegetative propagation. Other grasses occasionally termed reeds include species in (reed grasses), such as C. canadensis, a native North American bunchgrass reaching 2 meters in moist meadows, distinguished by awned lemmas and less invasive tendencies. These vary by region, with over 250 species globally, but they lack the monolithic stands of true reeds. Taxonomic distinctions emphasize and Arundo for archetypal wetland dominants, while avoiding conflation with sedges or rushes.

Ecological Role and Invasiveness

Reeds, particularly Phragmites australis, play significant roles in wetland ecosystems by stabilizing soils through extensive rhizome networks that trap sediments and organic matter, thereby enhancing soil formation and preventing erosion in coastal and riparian zones. These plants also contribute to nutrient cycling, sequestering heavy metals, excess nitrogen, and phosphorus from water, which improves water quality in eutrophic environments. Additionally, reed stands support biodiversity by providing habitat for aquatic species, including fish refugia and nesting sites for birds such as red-winged blackbirds and marsh wrens, while their high primary productivity—up to several tons of biomass per hectare annually—forms the base of food webs in marshes. In their native ranges, such as Eurasian wetlands, reeds foster resilient ecosystems by filtering pollutants and promoting , with stands capable of storing substantial belowground carbon reserves. Native North American genotypes of P. australis similarly offer these services without dominating landscapes. However, the non-native Eurasian (P. australis subsp. australis, haplotype M), introduced to likely in the late 18th to early via , exhibits heightened invasiveness due to genetic traits enabling rapid clonal spread via rhizomes and prolific seed production. This variant has proliferated across wetlands, covering over 130,000 hectares in the alone by 2018, forming monocultures that outcompete native vegetation through and resource monopolization. The invasiveness of non-native reeds disrupts ecological balance by reducing plant diversity—studies show native species richness dropping by up to 70% in invaded marshes—and altering through dense mats that lower water tables and impede flow, leading to drier conditions unsuitable for obligate . While providing some benefits, invasive stands degrade quality for amphibians, , and waterfowl by creating less permeable barriers that limit access and increase risk from accumulated dead . Management efforts, including application and mechanical removal, are prioritized in regions like the U.S. Northeast and , where genetic analyses confirm the dominance of invasive haplotypes. Despite these impacts, some highlights potential services like enhanced soil stability in disturbed urban wetlands, underscoring the need for context-specific assessments rather than blanket eradication.

Technology and Engineering

Electrical and Mechanical Components

Reed switches are electromechanical devices comprising two ferromagnetic reeds hermetically sealed in a envelope, which close upon exposure to a and open when the field is removed. Invented in 1936 by Walter B. Ellwood at Bell Telephone Laboratories, the first commercial production occurred in 1940 for applications in early telephone exchanges. These switches offer advantages including low consumption, high reliability with billions of operational cycles, and immunity to environmental contaminants due to their sealed design, making them suitable for sensors in security systems, automotive proximity detection, and position sensing. Reed relays integrate a with an energizing coil to produce the actuating , functioning as compact electromagnetic switches with minimal contact bounce and fast switching speeds up to milliseconds. They excel in high-voltage , often exceeding 10 kV, and low-level signal switching, with applications in , medical devices, , and RF/ circuits where low and high are critical. Compared to electromechanical relays, reed relays provide longer mechanical life—typically over 10^9 operations—and smaller form factors, though they require careful shielding to avoid unintended actuation from stray fields. In , reed valves consist of thin, flexible petals—often made from carbon fiber composites or stamped metal—mounted over ports in two-stroke engines to permit unidirectional flow of the fuel-air mixture into the while blocking . Introduced in high-performance two-stroke designs by the mid-20th century, they enhance by optimizing timing through differentials, with petal deflection governed by engine vacuum and stiffness; stiffer petals suit higher RPMs for reduced blowback, while softer ones improve low-speed response. Common in motorcycles, outboard motors, and , reed valves can wear from fatigue or contamination, necessitating periodic inspection for cracks or carbon buildup to maintain performance.

Scientific Instruments and Processes

Reed switches consist of two overlapping ferromagnetic reeds hermetically sealed in a , which make or break when exposed to a , enabling non-contact sensing in various scientific setups. Their operation relies on the of the reeds, attracting them together at thresholds as low as 10 ampere-turns for normally open types, providing reliable switching for low-power signals without mechanical wear. In scientific instruments, reed switches facilitate magnetic field detection, such as in experiments where a measures the field strength of a by observing switching points along its axis, correlating relay activation with calculated field values via the formula B = \mu_0 n I, where n is turns per and I is current. This method, employed in as of 2024, allows students to verify theoretical predictions empirically, with reed relays offering fast response times under 1 for precise timing in dynamic field measurements. Reed relays, which integrate a reed switch with an energizing coil, extend these capabilities to controlled switching in instruments requiring isolation of low-level signals, such as in () testing where they connect pins for functional verification without introducing noise, achieving contact resistances below 100 milliohms. Their hermetic sealing ensures consistent performance in vacuum or controlled atmospheres, vital for processes like semiconductor probing, and supports cycling rates up to 200 Hz for repetitive testing protocols. Beyond detection, reed-based devices appear in educational demonstrations of , powering simple motors where the switch interrupts current to create pulsed fields, achieving rotational speeds proportional to applied voltage, as tested in projects quantifying motor performance under varying supplies from 1.5 to 12 volts. These applications highlight the device's utility in causal investigations of magnetic interactions, though limitations include sensitivity to mechanical shock and finite lifespan of approximately 10^8 operations under low loads.

Medicine

Named Medical Terms and Discoveries

Reed-Sternberg cells are the giant, multinucleated tumor cells observed in classic , typically comprising less than 1% of the lymphoid infiltrate but essential for diagnosis. These cells, often featuring bilobed nuclei with prominent eosinophilic nucleoli resembling "owl's eyes," were independently described by pathologist Carl Sternberg in 1898 and elaborated by Reed in her 1902 doctoral thesis based on examinations of tissues from affected patients. Reed's detailed histological analysis at confirmed their neoplastic B-cell origin and distinction from reactive lymphocytes, advancing the understanding of as a clonal rather than an infectious process. Reed's syndrome, also termed hereditary leiomyomatosis and renal cell cancer (HLRCC) syndrome, denotes a rare autosomal dominant genodermatosis caused by germline mutations in the FH gene encoding fumarate hydratase, an enzyme in the tricarboxylic acid cycle. First delineated by Reed et al. in 1973 through pedigree analysis of families exhibiting familial clustering of benign tumors, it manifests primarily as multiple cutaneous leiomyomas—painful, firm papules or nodules on the trunk and extremities—and uterine fibroids in females, with up to 15-20% risk of aggressive . Affected individuals, often presenting in adulthood with lesions numbering from dozens to hundreds, face heightened morbidity from tumor-related pain and potential, underscoring the syndrome's link to metabolic dysregulation and pseudohypoxia signaling. Reed nevus, or pigmented spindle cell nevus, represents a distinctive melanocytic lesion characterized by symmetrical, heavily pigmented macules or papules with irregular borders, histologically featuring spindle-shaped melanocytes in a nested architecture without significant atypia. Named after pathologist Richard Reed following its description in 1975 from clinicopathologic studies of atypical nevi mimicking , these nevi pose diagnostic challenges due to overlap with nevi and early melanomas, necessitating dermoscopic evaluation revealing starburst patterns or atypical pigment networks for differentiation. Major contributions to medical discoveries under the Reed name include U.S. physician Walter Reed's 1900-1901 Yellow Fever Commission experiments in , which empirically validated Carlos Finlay's mosquito transmission hypothesis through controlled human volunteer exposures, proving as the and enabling eradication strategies that reduced incidence from thousands of cases annually to near elimination in controlled settings. This work, involving ethical human challenge trials with , shifted paradigms from contaminated fomites to vectors, foundational to modern vector-borne disease control.

Music

Reeds in Instruments

Reeds in musical instruments function as vibrating elements that generate through the induced by airflow, typically from a player's breath or mechanical . These components are engineered to produce specific pitches and timbres by varying in shape, thickness, and material properties, with the reed's flexibility allowing it to interrupt and resume airflow rapidly, creating pressure waves. Traditionally, reeds are fashioned from the culms (stems) of , a grass native to regions including the Mediterranean and , selected for its straight, hollow structure and acoustic qualities that enable precise vibration control. This cane is harvested at maturity, typically in its second or third year when diameters range from 10-26 mm depending on the instrument, then cured and processed through gouging, shaping, and tying to fit mouthpieces. Instrument reeds are classified into three main categories based on their vibration mechanism: beating (single) reeds, double reeds, and free reeds. Single reeds feature a solitary cane blade fixed to a mouthpiece that intermittently contacts a flat surface (the "lay") during , producing a brighter, more projecting tone suited to cylindrical-bore instruments. Examples include the , where reeds measure about 70 mm in length and 12-20 mm in width, and saxophones, which use similar but scaled proportions for to baritone models. Double reeds consist of two closely aligned pieces that beat against each other without a fixed frame, yielding a reedy, nasal characteristic of conical-bore woodwinds like the (reeds approximately 70 mm long, folded at the tip) and (longer, around 50-60 mm per blade). Free reeds, by contrast, oscillate through a slot in a rigid frame without contacting it, enabling polyphonic capabilities in bellows-driven or mouth-blown designs; prominent examples are the harmonica, , and , where metal reeds (often or , 10-30 mm long) replace for durability and tuning precision. The use of cane dates back at least 5,000 years, with archaeological evidence from ancient Egyptian and Mesopotamian artifacts indicating early single- and double-reed prototypes, while free-reed designs trace to Asian traditions predating Western adoption by centuries. Modern manufacturing has introduced synthetic alternatives, such as fiber composites or plastics, to address inconsistencies in cane due to environmental factors like and climate variability, though cane remains preferred for its organic responsiveness in professional settings. Reed strength is graded numerically (e.g., 1-5 for clarinets, where higher numbers indicate harder cane resisting for louder ), influencing playability and longevity, with a single professional reed lasting 1-4 weeks under regular use.

Instrument Types and History

Reed instruments are classified into three primary types based on the reed mechanism: single-reed, double-reed, and free-reed. Single-reed instruments feature a single thin strip of or synthetic material that vibrates against a mouthpiece opening when air is blown across it, producing sound through the resulting turbulence. Common examples include the and families, where the reed is fastened to a flat mouthpiece. Double-reed instruments use two closely aligned blades of that vibrate against each other, creating a narrower, more piercing tone; notable instruments are the , English horn, and . Free-reed instruments employ metal reeds that vibrate freely within a frame without contacting another surface, allowing for continuous sound production even when the bellows or mouth pressure varies; this category encompasses the harmonica, , , and Asian mouth organs like the Chinese sheng. The origins of reed instruments trace back to ancient civilizations, with rudimentary single- and double-reed pipes crafted from plant stalks or animal bones as early as 2700 BCE in , where devices like the memet—a simple idioglot single-reed pipe—were used in rituals. Double-reed precursors, such as the Greek , appeared around the same era for ceremonial and theatrical purposes, evolving into medieval European shawms by the , which featured conical bores and loud, nasal tones suitable for outdoor performances. Single-reed development lagged in the West, with folk instruments like the serving as prototypes until Johann Christoph Denner refined the around 1700 in , , by adding keys and a chalumeau-like to extend its range. Double-reed instruments saw significant refinement in the , as French makers like Jean Hotteterre transformed the into the hautbois (ancestor of the modern ) around 1650, narrowing the bore and adding keys for greater control and softer dynamics in court ensembles. The emerged concurrently in as a bass-range double-reed for marching bands, with early models featuring a folded wooden tube for portability. Free-reed instruments originated in ancient East and , with the sheng documented in by the 3rd century BCE for court music, its multiple bamboo pipes each housing a metal tongue that vibrates independently. These reached via trade routes, inspiring 18th-century experiments; Christian Gottlieb Kratzenstein demonstrated a free-reed synthesizer in 1738, paving the way for the harmonium by Alexandre Debain in 1842 and the widespread adoption of accordions in the for folk and classical settings. By the , Adolphe Sax's invention of the in 1840 integrated single-reed mechanics with brass construction, expanding the category's tonal versatility in orchestras and bands.

Organizations

Educational Institutions

Reed College is a private liberal arts college in Portland, Oregon, established in 1908 through the bequests of Oregon pioneers Simeon Gannett Reed and Amanda Reed, with its first classes held in 1911. The institution occupies a 116-acre campus in southeast Portland and enrolls approximately 1,400 undergraduates from diverse backgrounds, maintaining a 9:1 student-to-faculty ratio that supports intensive academic engagement. Reed emphasizes , personal inquiry, and interdisciplinary study, offering 38 majors in fields such as , natural sciences, and social sciences. A hallmark of Reed's pedagogy is its use of narrative evaluations rather than letter grades for most courses; while internal grades are recorded on transcripts, they are not disclosed to students to reduce competitive pressures and foster focus on mastery and intellectual growth. All students complete a mandatory year-long sequence, Humanities 110, structured as small-group conferences that encourage close textual analysis and debate. The college's requirement for all graduates underscores its commitment to original research, with seniors producing substantial independent projects under faculty supervision. Reedley College, a public in , was founded in 1926 as part of the State Center Community College District, relocating to its current campus in 1956 and serving over 10,000 students annually through associate degrees, certificates, and transfer programs in areas like , , and . With and a focus on vocational and foundational , it operates on a 350-acre site and maintains low in-state tuition of $1,304 per year.

Publishing and Business Entities

RELX plc, formerly known as Reed Elsevier, is a multinational information and analytics company with origins in , formed in 1993 through the merger of Reed International—a British trade book and magazine publisher—and the Dutch and publisher. The company reported publishing revenue of $5.28 billion in 2018, positioning it as the world's largest publisher by revenue that year, primarily through subsidiaries like , which focuses on scientific, technical, and medical (STM) content. By 2015, rebranded to emphasize analytics and decision tools over traditional , though continues to produce peer-reviewed journals and central to and . Reed Business Information (RBI), a historically under Reed International, operated as one of the largest (B2B) publishers in the United States, providing specialized information to sectors including media, , , and . 's portfolio included trade magazines, databases, and online platforms serving professional audiences, with a focus on data-driven content for industry decision-making. In 2013, sold RBI's Australian operations to refocus on core markets, and by the 2020s, RBI brands integrated into , shifting toward risk analytics while retaining informational publishing roots. Smaller entities include Robert D. Reed Publishers, an independent house producing over 200 titles since the , emphasizing self-improvement and inspirational . Reed Publishing Co. offers print, apparel, and digital media products, drawing from family-authored content on and timeless ideas. These smaller operations contrast with RELX's scale, often prioritizing niche markets over global .

People

Individuals with Surname Reed

Walter Reed (September 13, 1851 – November 23, 1902) was a U.S. and major who led the Commission in , confirming through experiments that the disease is transmitted by mosquitoes rather than direct contact or contaminated goods. His work, building on Carlos Finlay's hypothesis, enabled control measures that eradicated from by 1902 and advanced practices globally. Lou Reed (March 2, 1942 – October 27, 2013) was an musician, singer, and songwriter who served as , vocalist, and principal songwriter for , influencing , , and with raw lyrics on urban life, drugs, and sexuality. Born in and raised on , Reed drew from and , later pursuing a solo career with hits like "Walk on the Wild Side" from the 1972 album . Ishmael Reed (born February 22, 1938) is an American writer known for over 30 books of poetry, novels, essays, and plays that blend , , and Neo-Hoodoo aesthetics to critique American culture, race, and power structures. His debut novel The Free-Lance Palbbearers (1967) launched a career marked by works like Mumbo Jumbo (1972), which reimagines history through American folklore, and he has edited anthologies promoting diverse voices outside mainstream literary norms. Oliver Reed (February 13, 1938 – May 2, 1999) was a British actor recognized for portraying rugged, masculine characters in over 100 films, including roles in The Trap (1966), Oliver! (1968), and (2000) as Proximo. Known for a persona involving heavy drinking, Reed's career spanned swashbucklers, villains, and historical dramas, with his death from a heart attack during 's production in attributed to alcohol-related complications after a pub contest. Rex Reed (born October 2, 1938) is an American film critic, , and occasional who has reviewed films for over 60 years, contributing to outlets like , , and , often with acerbic, unfiltered commentary on . A member of the , Reed authored books on cinema and appeared in films, maintaining a stance against studio publicists and trends.

Individuals with Given Name Reed

Reed Smoot (January 10, 1862 – February 9, 1941) was a U.S. Senator from Utah, serving continuously from March 4, 1903, to March 3, 1933, as a Republican. Born in Salt Lake City to Mormon pioneers, Smoot rose as a businessman in Provo, Utah, managing sugar factories and banks before entering politics. As the first Latter-day Saint apostle elected to the Senate, his 1903 seating sparked a four-year investigation into church influence and polygamy allegations, ultimately affirming his eligibility despite opposition from Protestant groups fearing theocratic encroachment. Smoot co-authored the Smoot-Hawley Tariff Act of 1930, which raised U.S. import duties on over 20,000 goods to protect domestic industries amid the Great Depression, though economists later attributed it to exacerbating global trade contraction and deepening the downturn through retaliatory tariffs from trading partners. Reed Hastings (born October 8, 1960) is an American entrepreneur and the co-founder of , which he established in 1997 with as a rental service. Hastings, who previously founded and sold software company in 1997, pivoted to streaming in 2007, growing it into a global subscriber base exceeding 270 million by 2023 through original content investment and data-driven algorithms. He served as CEO from inception until January 19, 2023, when he transitioned to executive chairman, overseeing the company's expansion from a rental model to a dominant streaming platform valued at over $300 billion in as of 2024. Hastings holds a B.S. in mathematics from and has advocated for , co-founding the Learning platform. Reed Diamond (born July 20, 1967) is an American actor recognized for portraying Detective Mike Kellerman on the NBC series Homicide: Life on the Street from 1993 to 1999, earning a Screen Actors Guild Award as part of the ensemble. Trained at the Juilliard School after growing up in New York City, Diamond debuted professionally in the 1990 film Memphis Belle and later appeared in high-profile roles such as Laurence Macy in Joss Whedon's Dollhouse (2009–2010) and recurring parts in 24, The Shield, and Agents of S.H.I.E.L.D.. His film work includes supporting turns in Moneyball (2011) and The Astronaut's Wife (1999), often playing authoritative or morally complex figures in procedural dramas.

Places

Settlements

Reed is a village and in the district of , , situated on a chalk ridge near the county's highest point. Located approximately 3 miles (5 km) south of Royston, 15 miles (24 km) south of , and 35 miles (56 km) north of , the parish encompasses rural farmland and historical sites dating to prehistoric times, with evidence of and medieval occupation. In the United States, Reed refers to several small communities, including an unincorporated hamlet in , established in the mid-twentieth century as a predominantly African-American farming settlement along U.S. Highway 65, about 6 miles (10 km) north of McGehee. The community had a population of 130 as of the 2020 census. Reed Plantation is an unincorporated township in , encompassing rural areas and the village of Wytopitlock, known for its salmon fishing and outdoor recreation opportunities. Historically, Reed's Settlement was an early Anglo-American community in Panola County, Texas, founded in the 1830s by Baptist minister Isaac Reed, who migrated from Tennessee; it represented one of the first organized settlements in the area before declining in the late nineteenth century.

Historical and Natural Sites

The Reed Flute Cave (Lúdì Yán), located in Guilin, Guangxi Zhuang Autonomous Region, China, is a natural limestone karst cave formed approximately 180 million years ago through water erosion and carbonate deposition. Spanning over 240 meters in length with chambers up to 87 meters high, the cave features stalactites, stalagmites, stone pillars, and curtains illuminated by multicolored lights to highlight formations resembling mythical scenes, such as the Crystal Palace and Sky-Connecting Pillar. Inscriptions dating to the Tang Dynasty (618–907 AD) and Song Dynasty (960–1279 AD) adorn the walls, indicating early human visitation, while reeds growing at the entrance—traditionally used to craft flutes—gave the site its name. Rediscovered for modern tourism in the 1960s after use as an air-raid shelter during World War II, it attracts over a million visitors annually as a showcase of karst geology. The in Midland, Cabarrus County, , marks the site of the first documented in the United States, when 12-year-old Conrad Reed found a 17-pound nugget in a creek on his family's property on March 30, 1802 (though family tradition dates the initial find to 1799). This event sparked North Carolina's , producing an estimated $15 million in by 1835 and influencing the establishment of the U.S. Mint branch in in 1837. Operations at the mine, which included underground shafts and stamp , continued intermittently until 1918; the 225-acre site now operates as a state historic site managed by the North Carolina Department of Natural and Cultural Resources, featuring preserved mining artifacts, a visitor center, and trails demonstrating 19th-century extraction techniques. Other notable natural sites include the Nathaniel P. Reed Hobe Sound National Wildlife Refuge in , established in 1969 and encompassing 1,092 acres of pristine beach, dunes, and scrub habitat along 4.5 miles of undeveloped Atlantic coastline, protecting nesting grounds and serving as a critical buffer against coastal development. Further north, Reed Bingham State Park in Norman Park, , covers 1,330 acres around a 375-acre lake formed by damming the Little River in 1973, offering ecosystems of pine forests, cypress swamps, and rare plants like the Georgia plume, with activities focused on , , and observing diverse including alligators and bald eagles.

Other Uses

Miscellaneous Terms and Concepts

A reed refers to the stalk of various tall, grass-like , particularly Phragmites australis, a species in the family that grows 1–6 meters tall from elongated rhizomes and stolons, forming dense stands in moist habitats. This plant produces feathery flower clusters and stiff stems, thriving in marshes, ditches, and estuaries, with invasive non-native subspecies spreading aggressively via rhizomes. In musical instruments, a reed is a thin strip of cane or metal affixed to the mouthpiece of woodwind instruments such as the , , , and , where airflow causes it to vibrate and produce sound. Single reeds, used in and , are flat and bound to the mouthpiece, while double reeds, as in and , consist of two blades beating together. In weaving, a reed is a comb-like on a with vertical slits (dents) that space and separate threads evenly during the process, measured in dents per inch to determine . Weavers select reed sizes based on thickness and desired fabric , sleying multiple threads per dent when finer spacing is needed. An electrical is an electromechanical device comprising two ferromagnetic reed blades hermetically sealed in a , which close or open a in response to an external from a nearby . Invented in the early , these switches are valued for their simplicity, reliability in low-power applications, and use in sensors for , fluid levels, and automotive systems. In biblical contexts, a measuring reed denotes a unit of length approximately 6 cubits (about 2.7–3 meters or 8.75–10 feet), used for surveying structures as described in 40:5, where it equals a long cubit plus a handbreadth. This rod-like measure, derived from natural plant stalks, facilitated architectural and prophetic visions of temple dimensions.

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